arm64: defconfig: enable bpf/cgroup firewalling

This avoids the following systemd warning:

[    2.618538] systemd[1]: system-getty.slice: unit configures an IP
 firewall, but the local system does not support BPF/cgroup firewalling.
[    2.630916] systemd[1]: (This warning is only shown for the first
 unit using IP firewalling.)
Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: NSong Liu <songliubraving@fb.com>
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -3,6 +3,7 @@ CONFIG_POSIX_MQUEUE=y
 CONFIG_AUDIT=y
 CONFIG_NO_HZ_IDLE=y
 CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BPF_SYSCALL=y
 CONFIG_BPF_JIT=y
 CONFIG_PREEMPT=y
 CONFIG_IRQ_TIME_ACCOUNTING=y
@@ -22,6 +23,7 @@ CONFIG_CPUSETS=y
 CONFIG_CGROUP_DEVICE=y
 CONFIG_CGROUP_CPUACCT=y
 CONFIG_CGROUP_PERF=y
+CONFIG_CGROUP_BPF=y
 CONFIG_USER_NS=y
 CONFIG_SCHED_AUTOGROUP=y
 CONFIG_BLK_DEV_INITRD=y